Set top box



FIG. 1 is a top view showing our new set top box design;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is another side view thereof;

FIG. 5 is a back view thereof; and,

FIG. 6 is a bottom view thereof.

In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design. 

The ornamental design for a set top box, as shown and described. 